How do you find the area of an image in MATLAB?

total = bwarea( BW ) estimates the area of the objects in binary image BW . total is a scalar whose value corresponds roughly to the total number of on pixels in the image, but might not be exactly the same because different patterns of pixels are weighted differently.

How do I crop part of an image in MATLAB?

Crop the image. Double-click the left mouse button or right-click inside the boundary of the crop rectangle and select Crop Image from the context menu. Retrieve the coordinates of the crop rectangle. Right-click inside the boundary of the crop rectangle and select Copy Position from the context menu.

How do I automatically crop an image in MATLAB?

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% Read the image.
grayImage = imread(filename);
% Display the image.
imshow(grayImage);
S = regionprops(grayImage,’BoundingBox’,’Area’);
[MaxArea,MaxIndex] = max(vertcat(S.Area));
imshow(grayImage,’InitialMagnification’,20)
%// Highlight the required object.

How do I find the area of a photo?

Use the shape attribute of the image to get the height and width of the image. It fetches the number of channels in the image. Calculate the area as, area = height * width. Display the area.

What is area image?

An image area is the region within a page that includes the copy; the image area is designated by the margins of the page.

How do I mask an image in Matlab?

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To create a mask like you said: Theme. maxGL = max(grayImage(:))
To apply the mask to an RGB image, use this code: Theme. % Mask the image using bsxfun() function to multiply the mask by each channel individually.
If it’s grayscale, you can do it simpler like this: Theme. grayImage(~mask) = 0;

How do you define different areas in an image map?

Chapter Summary

Use the HTML element to define an image map.
Use the HTML element to define the clickable areas in the image map.
Use the HTML usemap attribute of the element to point to an image map.